Application of large capacity three-level GTO inverters for plate mill drives K. Morita, H. Hishiya, S. Kayama, A. Kubota, F. Nishimura, H. Koumo and H. Masuda Rev. Met. Paris, 94 6 (1997) 777-784 Published online: 17 January 2017 DOI: 10.1051/metal/199794060777